When comparing Blur - A Launcher Replacement vs Mi Launcher (MIUI), the Slant community recommends Mi Launcher (MIUI) for most people. In the question“What are the best launchers for Android?”Mi Launcher (MIUI) is ranked 29th while Blur - A Launcher Replacement is ranked 38th. The most important reason people chose Mi Launcher (MIUI) is:

Almost all Google services are removed from this Android-based UI in favor of creating a competing ecosystem of apps, games, themes and services.
China government prohibit the Google services

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Pros

Pro

Provides an open alternative to Google Now cards

Allows developers to create Google Now-like pages and cards through their API.

Pro

Free to use

Blur is free to download and use, though it does offer in app purchases that range from $0.99 - $99.99 per item.

Pro

Independent of Google services

Almost all Google services are removed from this Android-based UI in favor of creating a competing ecosystem of apps, games, themes and services.China government prohibit the Google services

Pro

Combines best of iOS and Android launchers

MIUI has visual similarities to iOS and TouchWiz and combines functionality from both iOS and Android OS and its variants. For example, MIUI has no apps drawer and instead puts all app on homescreen pages the same way iOS does.

Pro

Runs faster than stock Android

MIUI includes performance tweaks that give it a edge in speed compared to stock Android.

Pro

Detailed installation instructions for supported devices

Step by step instructions (with screenshots) for flashing MIUI ROM can be found for each of the supported devices on the companies website. For example, here is the flashing guide for Nexus 5.

Pro

Fast development cycle

New features and updates are released regularly.

Cons

Con

Unstable

Blur is still in early stages of development and tends to have hiccups and crashes often.

Con

Some bundled services are available only in Chinese

Xiaomi, the developers of MIUI are Chinese and their primary maket is China. As such primary language for most apps and services is Chinese and not all of them have yet been translated to English or any other language.

Con

A Mi account is required for using bundled services

Various services and apps require a Mi account. For example, buying new themes requires spending Mi currency that can only be obtained if a Mi account is available.